| Abstract
| - Binding or dissociation energies of the ground state, S0, the first electronic excited state, S1, and the ionground state, I0, of the p-methoxyphenetylamine(H2O)1-4 complexes, referred to henceforth as eitherMPEA(H2O)1-4 or by their stoichiometric ratios 1:1−4, have been analyzed by threshold ion fragmentation.MPEA(H2O)1-4 complexes were prepared by the supersonic expansion of premixed samples containingappropriate amounts of MPEA and water molecules into carrier gas He. A number of isomers, with characteristictransition energies, have been identified: two for MPEA(H2O)1 at 35 676 and 35 689 cm-1, one forMPEA(H2O)2 at 35 687, one for MPEA(H2O)3 at 35 571 and two for MPEA(H2O)4 at 35 419 and 35 422cm-1 respectively. The ionization energy and fragmentation thresholds, the latter defined as the onset energyof the process MPEA(H2O)n* + hν→ MPEA(H2O)n-1+ + H2O, have been determined, and from them thedissociation energies for the set of MPEA(H2O)1-4 isomers in their ground state, first electronic excited states,and ion ground states were readily obtained. The set of values are compared with those computed for thewater association complexes.
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